Information processing apparatus, information processing method, and storage medium

Abstract

An apparatus includes an acquisition unit configured to acquire a signal that indicates a position of a pixel where a change in luminance has occurred and a time when the change in luminance has occurred, a determination unit configured to determine, on a pixel-by-pixel basis, an evaluation value corresponding to a frequency at which a change in luminance in a predetermined direction has occurred, based on the signal, a generation unit configured to generate an image indicating a direction of the change in luminance at the position of the pixel where the change in luminance has occurred, and a control unit configured to control display of the generated image based on the evaluation value.

What is claimed is: 
     
       1. An apparatus comprising:
 at least one processor; 
 a memory coupled to the at least one processor storing instructions that, when executed by the at least one processor, cause the processor to function as: 
 an acquisition unit configured to acquire a signal that indicates a position of a pixel where a change in luminance has occurred and a time when the change in luminance has occurred; 
 a determination unit configured to determine, on a pixel-by-pixel basis, an evaluation value corresponding to a frequency at which a change in luminance in a predetermined direction has occurred, based on the signal, wherein the predetermined direction includes a positive direction indicating that a luminance value of a target pixel is larger than a previous luminance value of the target pixel or a negative direction indicating that a luminance value of a target pixel is smaller than the previous luminance value of the target pixel; 
 a generation unit configured to generate an image indicating a direction of the change in luminance at the position of the pixel where the change in luminance has occurred; and 
 a control unit configured to control display of the generated image based on the evaluation value. 
 
     
     
       2. The apparatus according to  claim 1 , wherein the control unit performs control to distinguish and display a position of a pixel for which the evaluation value is greater than or equal to a predetermined threshold value and a position of a pixel for which the evaluation value is less than the predetermined threshold value. 
     
     
       3. The apparatus according to  claim 2 , wherein the control unit performs control to superimpose and display, on the generated image, an image obtained by assigning a first pixel value indicating that the change in luminance in the predetermined direction has not occurred, to the position of the pixel for which the evaluation value is greater than or equal to the predetermined threshold value, and assigning a second pixel value indicating that the change in luminance in the predetermined direction has occurred, to the position of the pixel for which the evaluation value is less than the predetermined threshold value. 
     
     
       4. The apparatus according to  claim 2 , wherein the control unit performs control to display the generated image at the position of the pixel for which the evaluation value is less than the predetermined threshold value. 
     
     
       5. The apparatus according to  claim 1 , wherein the evaluation value is a cumulative value of a number of occurrences of the change in luminance in the predetermined direction. 
     
     
       6. The apparatus according to  claim 1 , wherein the evaluation value indicates whether a number of occurrences of the change in luminance in the predetermined direction is an even number or an odd number. 
     
     
       7. The apparatus according to  claim 1 , wherein the control unit performs control to change a pixel display color based on a magnitude of the evaluation value. 
     
     
       8. The apparatus according to  claim 1 ,
 wherein the generation unit generates an image indicating a position of a pixel where a change in luminance has occurred at a predetermined time interval, and 
 wherein the control unit performs control to superimpose and display the generated image at the predetermined time interval in a two-dimensional space formed by an axis related to a space and an axis related to a time. 
 
     
     
       9. The apparatus according to  claim 1 , wherein the control unit outputs a notification about an abnormality in a case where a change in the evaluation value is greater than a predetermined percentage. 
     
     
       10. The apparatus according to  claim 1 , wherein the control unit performs control to display the generated image in a three-dimensional coordinate space formed by a T axis indicating a time axis and X- and Y-direction axes related to a space. 
     
     
       11. The apparatus according to  claim 1 , wherein the acquisition unit compares a necessary time for a number of photons to reach a predetermined value in a pixel to detect a change in luminance, and in a case where a previous measured time of the necessary time subtracted from a latest measured time of the necessary time is a threshold value or more, the acquisition unit detects the signal indicating a change in luminance in the negative direction and in a case where the latest measured time of the necessary time subtracted from the previous measured time of the necessary time is the threshold value or more, the acquisition unit detects the signal indicating a change in luminance in the positive direction. 
     
     
       12. A non-transitory computer-readable storage medium storing a program for causing a computer to perform a method comprising:
 acquiring a signal that indicates a position of a pixel where a change in luminance has occurred and a time when the change in luminance has occurred; 
 determining, on a pixel-by-pixel basis, an evaluation value corresponding to a frequency at which a change in luminance in a predetermined direction has occurred, based on the signal, wherein the predetermined direction includes a positive direction indicating that a luminance value of a target pixel is larger than a previous luminance value of the target pixel or a negative direction indicating that a luminance value of a target pixel is smaller than the previous luminance value of the target pixel; 
 generating an image indicating a direction of the change in luminance at the position of the pixel where the change in luminance has occurred; and 
 controlling display of the generated image based on the evaluation value. 
 
     
     
       13. The non-transitory computer-readable storage medium according to  claim 12 , wherein the generated image is displayed so as to distinguish a position of a pixel for which the evaluation value is greater than or equal to a predetermined threshold value and a position of a pixel for which the evaluation value is less than the predetermined threshold value. 
     
     
       14. The non-transitory computer-readable storage medium according to  claim 12 ,
 wherein the evaluation value is a cumulative value of a number of occurrences of the change in luminance in the predetermined direction, or 
 wherein the evaluation value indicates whether a number of occurrences of the change in luminance in the predetermined direction is an even number or an odd number. 
 
     
     
       15. The non-transitory computer-readable storage medium according to  claim 12 , wherein the generating generates an image indicating a position of a pixel where a change in luminance has occurred at a predetermined time interval. 
     
     
       16. The non-transitory computer-readable storage medium according to  claim 12 , wherein the controlling outputs a notification about an abnormality in a case where a change in the evaluation value is greater than a predetermined percentage. 
     
     
       17. A method comprising:
 acquiring a signal that indicates a position of a pixel where a change in luminance has occurred and a time when the change in luminance has occurred; 
 determining, on a pixel-by-pixel basis, an evaluation value corresponding to a frequency at which a change in luminance in a predetermined direction has occurred, based on the signal, wherein the predetermined direction includes a positive direction indicating that a luminance value of a target pixel is larger than a previous luminance value of the target pixel or a negative direction indicating that a luminance value of a target pixel is smaller than the previous luminance value of the target pixel; 
 generating an image indicating a direction of the change in luminance at the position of the pixel where the change in luminance has occurred; and 
 controlling display of the generated image based on the evaluation value. 
 
     
     
       18. The method according to  claim 17 , wherein the generated image is displayed so as to distinguish a position of a pixel for which the evaluation value is greater than or equal to a predetermined threshold value and a position of a pixel for which the evaluation value is less than the predetermined threshold value. 
     
     
       19. The method according to  claim 17 ,
 wherein the evaluation value is a cumulative value of a number of occurrences of the change in luminance in the predetermined direction, or 
 wherein the evaluation value indicates whether a number of occurrences of the change in luminance in the predetermined direction is an even number or an odd number. 
 
     
     
       20. The method according to  claim 17 , wherein the generating generates an image indicating a position of a pixel where a change in luminance has occurred at a predetermined time interval. 
     
     
       21. The method according to  claim 17 , wherein the controlling outputs a notification about an abnormality in a case where a change in the evaluation value is greater than a predetermined percentage.